Troubleshooting & Maintenance Flashcards
6 cards from real Business Phone Systems practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Troubleshooting & Maintenance flashcards as text
What is the first step when diagnosing poor VoIP call quality on a business phone system?
Answer: Run a network test to check latency, jitter, and packet loss between the phone and the SIP server
Network performance testing identifies whether call quality issues stem from the LAN, WAN, or ISP rather than the phone hardware or PBX.
What causes one-way audio in a VoIP call?
Answer: A NAT or firewall issue blocking RTP media from flowing in one direction
One-way audio usually occurs when a NAT or firewall blocks RTP packets traveling in one direction while allowing the other.
What does it mean when a SIP phone shows 'Registration Failed'?
Answer: The phone cannot authenticate with the SIP registrar, usually due to wrong credentials, server address, or network issue
Registration failure means the SIP REGISTER request was rejected, typically because of incorrect username, password, SIP server address, or a network block.
What tool can be used to capture and analyze SIP and RTP packets to diagnose VoIP issues?
Answer: Wireshark
Wireshark captures network packets and has built-in VoIP analysis tools that can decode SIP signaling and reconstruct RTP audio streams.
What does 'echo' in a VoIP call typically indicate?
Answer: Acoustic echo from a speakerphone or sidetone misconfiguration in the phone hardware
Echo is typically caused by acoustic feedback from speakers near microphones or by improper echo cancellation settings in the phone or gateway.
What is the purpose of a ping test when troubleshooting VoIP connectivity?
Answer: Measures round-trip latency and packet loss between a phone or PC and the SIP server
Ping sends ICMP echo requests to measure network round-trip time and identify packet loss, helping isolate network-layer VoIP problems.